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Module 6: Electromagnetism

Quick questions on Electromagnetic induction: HSC Physics Module 6

5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What are eddy currents?
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When a bulk conductor (a sheet, disc or block of metal) experiences a changing flux, induced EMFs drive circulating currents called eddy currents inside the conductor. They oppose the change in flux that produced them, so they exert a drag force on whatever is causing the flux change.
What is the induction coil?
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An induction coil is a transformer-like device used to produce high-voltage pulses from a low-voltage DC source. It has:
What is q1?
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State Faraday's law and Lenz's law in one sentence each. [2 marks]
What is q2?
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A coil of 200200 turns experiences a flux change from 0.040 Wb0.040 \text{ Wb} to 0.010 Wb0.010 \text{ Wb} over 0.50 s0.50 \text{ s}. Calculate the average induced EMF. [3 marks]
What is q3?
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A conducting rod of length L=0.50 mL = 0.50 \text{ m} slides at v=4.0 m/sv = 4.0 \text{ m/s} on parallel rails in a field B=0.30 TB = 0.30 \text{ T} perpendicular to the plane of the rails. (a) Calculate the motional EMF. (b) If the circuit resistance is 0.20Ω0.20 \Omega, find the induced current.

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